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EF running rich 

 

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 Post subject: EF running rich
Posted: Mon May 07, 2007 11:35 pm 
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I think the old EF is running rich.

I have no idea how to tell (fuel economy is like 16-17l per 100km)

You can sometimes smell the unburnt fuel in the exhaust.

Just wondering what i have to do to fix this and what may cause it.

 

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Posted: Mon May 07, 2007 11:58 pm 
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maybe time for a new oxygen sensor.

 

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Posted: Tue May 08, 2007 9:13 am 
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Most probably the aftermarket cam. Ive tried replacing the o2 sensor in mine and hasnt changed anything.

Fuel economy is great on the highway but around town the cam is playing havoc with fuel economy. The only fix i can think of is going to chiptorque and let them play with the AFR's.

Ive also heard of fitting an adjustable fuel regulator to fix it but i'd doubt that would work
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Posted: Tue May 08, 2007 11:48 am 
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oxy sensor probly is worth a try.
mine made a huge difference.
otherwise yeah, as said could be the cam.
does it blow any black smoke on load?
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Posted: Tue May 08, 2007 12:20 pm 
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AFAIK the cam shouldnt make that much dirrerence. The fuel injection works on a closed-loop feedback system. IE the oxygen sensor tells the ECU how much fuel is needed. The oxygen sensor is a key component in the engine management. My other suggestion would be the map sensor and perhaps manifold air temperature sensors.

Last edited by richard williams on Tue May 08, 2007 4:23 pm, edited 1 time in total.

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Posted: Tue May 08, 2007 12:41 pm 
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Yes the cam CAN cause a difference in fuel consumption. 'Hotted" up cams create a lower manifold vacuum than stock which plays up with the Map Sensor making the ECU squirt in more fuel thinking its under more load than it already is.

And yes the o2 sensor is important and should be replaced first up just to make sure. Although, the o2 sensor is completely ignored by the ECU in full throttle operation and only reads at part throttle.

As mentioned, Chiptorque have a pre programmed chip for Falcons with typical engine mods which will fix AFR's.

Could even be a faulty map sensor as previously mentioned i guess.
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Posted: Tue May 08, 2007 12:46 pm 
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The cam is only a mild one so it shouldnt make alll that much difference
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Posted: Tue May 08, 2007 12:49 pm 
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yeah cam is fairly mild. Not that much more on a ticky cam IMO.

Ill try a MAP and an oxy sensor.

 

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Posted: Tue May 08, 2007 12:52 pm 
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ok might sound silly but.... have you changed the air filter recently?

Dirty air filters can increase fuel consumption by up to 10% or something
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Posted: Tue May 08, 2007 12:58 pm 
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FordFairmont wrote:
ok might sound silly but.... have you changed the air filter recently?

Dirty air filters can increase fuel consumption by up to 10% or something

Yeah i been thinking that lately. I usually change it when i do the oil but i blew out my oil pressure switch so i did an oil change then but never did the filter.

 

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Posted: Tue May 08, 2007 1:28 pm 
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my ef chewed up the juice when i first got it

the mechanic cleaned the throttle body & consumption went back to normal

something about the ecu measuring the amount of air going in, and having a dirty air volume sensor screws it up

 

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Posted: Tue May 08, 2007 10:51 pm 
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and does it get to temp? s**t thermo and it'll continue to tell the ecu to add fuel

or the map sensor

 

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Posted: Wed May 09, 2007 4:50 pm 
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I have the same problem with a crow mild cam, I think Crow cams do run on std ECUs but very rich.
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Posted: Wed May 09, 2007 8:22 pm 
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yeah, crow cams have pritty big inlet sizes.
mine runs rich. slowly getting better thanks to adrian!
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Posted: Wed May 09, 2007 8:25 pm 
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my ef also runs rich, it has a mild crow cam, but blows smoke at startup, changed fuel pump and injectors, there is a strong smell of fuel in the car in the morning and when driving around normal it miss fires or pops but at high revs its normal does any one know why

 

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